---
id: CVE-2023-53828
title: 'Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv_monitor()'
summary: |-
  In the Linux kernel, the following vulnerability has been resolved:

  Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv_monitor()

  KSAN reports use-after-free in hci_add_adv_monitor().

  While adding an adv monitor,
      hci_…
severity: high
cvss: 7.8
cvssVector: 'CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cvssSource: cna
vendor: Linux
product: Linux
affected:
  - >-
    Linux >= b747a83690c8f53bc7a3f75899415c699b2c51aa <
    81d8e9f59df63b8358751c1ffed9f1cf5c796909
  - >-
    Linux >= b747a83690c8f53bc7a3f75899415c699b2c51aa <
    aafda69d4807f5edf3558c9534be9b911774e63a
  - >-
    Linux >= b747a83690c8f53bc7a3f75899415c699b2c51aa <
    8d66f7ced51cb924bc90278d6a0a26a52877271a
  - >-
    Linux >= b747a83690c8f53bc7a3f75899415c699b2c51aa <
    a2bcd2b63271a93a695fabbfbf459c603d956d48
  - Linux 6.0
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: total
  timestamp: '2026-10-15T21:37:35.211467Z'
published: '2025-12-09'
updated: '2026-10-15'
sourceUpdated: '2026-10-15T21:41:37.140Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2023-53828'
references:
  - url: 'https://git.kernel.org/stable/c/81d8e9f59df63b8358751c1ffed9f1cf5c796909'
  - url: 'https://git.kernel.org/stable/c/aafda69d4807f5edf3558c9534be9b911774e63a'
  - url: 'https://git.kernel.org/stable/c/8d66f7ced51cb924bc90278d6a0a26a52877271a'
  - url: 'https://git.kernel.org/stable/c/a2bcd2b63271a93a695fabbfbf459c603d956d48'
tags:
  - cve.org
epss: 0.00194
epssPercentile: 0.08453
ingestedAt: '2026-10-15T22:48:25.424Z'
---

## Overview

In the Linux kernel, the following vulnerability has been resolved:

Bluetooth: hci_sync: Avoid use-after-free in dbg for hci_add_adv_monitor()

KSAN reports use-after-free in hci_add_adv_monitor().

While adding an adv monitor,
    hci_add_adv_monitor() calls ->
    msft_add_monitor_pattern() calls ->
    msft_add_monitor_sync() calls ->
    msft_le_monitor_advertisement_cb() calls in an error case ->
    hci_free_adv_monitor() which frees the *moniter.

This is referenced by bt_dev_dbg() in hci_add_adv_monitor().

Fix the bt_dev_dbg() by using handle instead of monitor->handle.

## Affected

- `Linux >= b747a83690c8f53bc7a3f75899415c699b2c51aa < 81d8e9f59df63b8358751c1ffed9f1cf5c796909`
- `Linux >= b747a83690c8f53bc7a3f75899415c699b2c51aa < aafda69d4807f5edf3558c9534be9b911774e63a`
- `Linux >= b747a83690c8f53bc7a3f75899415c699b2c51aa < 8d66f7ced51cb924bc90278d6a0a26a52877271a`
- `Linux >= b747a83690c8f53bc7a3f75899415c699b2c51aa < a2bcd2b63271a93a695fabbfbf459c603d956d48`
- `Linux 6.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.